Question

QUESTION 1 The samples are necessarily considered a dependent when a. repeated measures are made on...

QUESTION 1

The samples are necessarily considered a dependent when

a. repeated measures are made on the same subjects
b. both groups consist of males
c. both groups consist of 8th grade pupils
d. any of the above is true

QUESTION 2

Observations are dependent when

a. the same subjects have been used for both sets of observations
b. subjects have been matched on some variable related to the varialbe observed
c. either of the above is true
d. the mean of X equals the mean of Y

QUESTION 3

The test between two dependent means requires that one must take special account of

a. the assumption of normality
b. the correlation between the two sets of measures
c. the standard deviation of the two variables
d. the case of equal sample size

QUESTION 4

Using paired observations (dependent observations) is most advantageous when

a. sample size is unequal
b. standard deviations must be estimated from samples
c. the correlation between the pairs of scores is high
d. the correlation between the pairs of scores is low

QUESTION 5

We wish to test the hypothesis of no difference between the means of the two dependent samples. There are 30 cases in the first sample and 30 cases in the second. The number of degrees of freedom for this test will be

a. 58
b. 28
c. 59
d. 29

QUESTION 6

We plan to use the direct-difference mehtod to test Ho: μ1- μ2 = 0 for a sample of 10 matched pairs. Once the D scores are computed, the procedure is identical to that for testing a hypothesis about

a.

a single mean

b.

the difference between two independent means

c.

the difference between two dependent means

d.

None of the above

QUESTION 7

We plan to use the direct difference method for dependent samples to test Ho: µ1- µ2 = 0. The following are the observations for our three matched pairs:

A          B

7          4

5          4

4          2

SSD =

a. 2
b. 14
c. 6
d. 8

QUESTION 8

We plan to use the direct-difference method for dependent samples to test HO: µ1- µ2 =0. The following are the observations for our three pairs:

A         B

7         4

5         4

4         2

Dbar =  

a. 2
b. 3
c. 1
d. 4

QUESTION 9

We plan to use the direct-difference method for dependent samples to test HO: μ1- μ2 =0. The following are the observations for our three pairs:

A B

7 4

5 4

4 2

ΣD2 =

a.

14

b.

9

c.

12

d.

16

QUESTION 10

The rule for constructing an interval estimate of μD is

Xbar ± tαSD

Dbar ± tαSD

tσ ± DbarSD

Dbar ± tαSxbar

Homework Answers

Answer #1

QUESTION 1 The samples are necessarily considered a dependent when
a.   repeated measures are made on the same subjects

QUESTION 2 Observations are dependent when
c.   either of the above is true

QUESTION 3 The test between two dependent means requires that one must take special account of
d.   the case of equal sample size

QUESTION 4 Using paired observations (dependent observations) is most advantageous when
c.   the correlation between the pairs of scores is high

QUESTION 5
Degree of freedom = number of paired values - 1 = 30 - 1 = 29
d.   29

QUESTION 6
a.   single mean

QUESTION 7
Difference is (7 - 4), (5 - 4), (4 - 2) = 3, 1, 2
Dbar = [(7 - 4) + (5 - 4) + (4 - 2)] / 3 = 2
SSD = (3 - 2)^2 + (1 - 2)^2 + (2 - 2)^2 = 2
a.   2

QUESTION 8
Dbar = [(7 - 4) + (5 - 4) + (4 - 2)] / 3 = 2
a.   2

QUESTION 9
D^2 = (7 - 4)^2 + (5 - 4)^2 + (4 - 2)^2 = 14
a.   14

QUESTION 10 The rule for constructing an interval estimate of μD is
Dbar ± tαSD

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